Sound-box.



K. SCOYFORD SOUND BOX.

APPLICATION FILED APR-30.1915.

Patented Nov. 7, 1916.

LOUIS K. SCOTFORD, OF CHICAGO, ILLINOIS.

SOUND-BOX.

Application filed April 30, 1915.

To (/77 whom it may concern:

lie it known that I. Loris K. Sco'rrom). a citizen of the l'nited States. and a resident of Chicago, in the county of Cook and State of lllinois. have invented certain 'new and useful Improvements in Sound Boxes, of which the following is a specification.

This invention relates to certain new and useful improvements in sound boxes for talking machines as will 1e fully described hereinafter and particularly pointed out in the appended claims.

Tn the drawings accom mnying and forming part hereof and which. it will be understood. represent the preferable though not necessary embodiment oi my inv ntion- Figure l'is a perspective view of a sound box made in :u-cm'dance with my invention. Fig. 2 is a vertical central section of the same. Fig. 3 is a side elevation. Fig. 'l is a section taken at substantially right angles to that shown in Fig. 2. Fig. 5 is a perspective view of the stylus bar detached. Fig. (i is a view 01 the blank from which the stylus bar is formed. Fig. 7 is a. perspective view of a modilied form of stylus bar detached. Fig. 8 is a side elevation of a sound boxhaving the modified form of stylus bar attached thereto. Fig. 9 is a perspective view. similar to Fig.4. of a modified form of insulating device. Fig. 10 is a perspective view of a modified form ot lining for the inside of the sound box.

Referring now to the details of the drawings by numerals: l designates the back of the box having a flat wall 9. against which the diaphragm vibrates. so that the vibrations are thrown from the diaphragm t directly against the flat surface of the back of the box. This back 1 may be secured in the box 5 in any desired way but I prefer to have the box proper cup shaped as indicated in Fig. 2 and the back 1 recessed as illustrated in Fig. r so that the back may be dropped into the cup shaped box proper. The back 1 also preferably has two pins (3 which project into perforations in the flange ot' the cup shaped box 5. To prevent the vibrations from being transmitted from the cup shaped box 5 to the back 1. and thence to the machine. I line the interior of the box with a rubber or other suitable ring 8 shown in Specification of Letters Patent.

Patented Nov. '7, 1916.

Serial No. 24,991.

Fig. -l. I also provide the openings in the flange of the box 5, into which the pins 6 project. with a bushing of rubber or other suitable material 10. this bushing not only acting to thoroughly insulate the pins 6 of the back 1 from the flange of the box, but also acting as a spacing device to prevent the re: r wall of the back 1 from contacting with the tlange of the cup shaped box Thus it will be seen that the back 1 is insulated both from the inner wall of the cup shaped box 5 and also from the flange of the box, while the lmrkmay yet be supported upon the pins (3 so as to have slight indepem'lent movement in the box. The front surface of the back 1 near its periphery is rounded otf-as indicated at 12 in Fig. l and a tubular o any other torm ot gasket 14 is located in the groove formed between the rounded oli part 12 of the front of the back 1 and the rubber lining S. This gasket ll forms the seat for the diaphragm r as will be seen t'rom Figs. '2 and l. similar gasket lli is placed on top of the diaphragm and a ring cover t is employed to hold these parts in position. this ring 18 having a llange 20 which lits over the outside wall of the box 5. the ring cover being secured to the box by means of screws as The stylus bar is of novel form and is also secured to the cover of the sound box in a novel manner. One form is shown in Figs. 1.2,?) and 5. In this TOI'IILI provide a cross bar 24 which has a triangular opening therein through which is secured. as by soldering. a. stylus bar '36 preferably made of one piece of any desired material. with one partthereof formed ol triangular shape for the purpose of holding the needle. The blank from which this stylus bar is termed is shown in Fig. (i. and the rectangular portion '27 is bent into triangular shape. as shown in Figs. 1. 5 and T. with the opening 28 for the needle ex tending clear through the triangular part or from one end to the other. The usual set screw :30 is provided to secure the needle. either of the cylindrical or triangular form. in the socket oi the stylus bar. .\s the trianguh 1' socket is open at both ends. the socket is in reality a breech loader tor the needles may be inserted through the opening 28 in the upper end. see Fig. l and shoved through the bar 26, the set screw 30 of course being loosened first, whereby the needle to be inserted will cause the expulsion of the used needle. The upper end of the stylus bar 26 is of course made in the usual thin manner and may be connected to the diaphragm 4: in the ordinary or any desired manner. The cross bar 24 to which the stylus bar is secured is preferably provided with two projcctinns having knife edges, and these coopei ate with hook shaped members 3-: whose rear ends project through the bar A and have securing means 36 thereon. This construction is particularly adapted to co-act with collars 38 having annular grooves into whibh fit the hook shaped ends 34 and the knife projections 32. After the collars are securely held between these parts 32 and 34, the stylus bar may be secured to the cover 18 by means of screws 40 which pass through openings in the collars 38, thus securing the collars and the cross bar to the sound box. I prefer to form these collars of wood fiber but any other desirable material may be used.

In lieu of the stylus bar and its connections shown in Figs. 1, 2 and 3, I may employ the form shown in Fig. 7. Here, instead. of using hook shaped members as in dicated in Fig. 5, I employ loops 42 which are secured as by riveting to the cross bar A, set screws 46 being employed having pointed ends. The thin loops 42 and the pointed ends of the screws 46 enter the grooves in collars identical with the collars 38 shown in Fig. 1. In both forms of this securingdevice it will be seen that I have a grooved collar with a screw passing through the collar to attach the same to the sound box and that the fulcrum of the stylus bar rests in the groove in the seat of the collar. Thus the fulcrum of the stylus bar is securely held in the grooved collars, while allowing free vibrations of the stylus bar. In the form shown in Fig. 7, the triangular part of the stylus bar does not pass on both sides of the cross bar 2% but the flat part of the stylus bar passes into a recess of the bar a l and is soldered therein so that the stylus bar is of one piece as in the other form, and yet passes on both sides of its cross bar.

In lieu of the construction shown in Fig. l, I may employ the construction shown in Fig. 9. In this modification the interior lining of the cup shaped sound box is itselfformed cup shaped in that it has a flange 50 which extends between the flange 52 of the box 5 and the rear side of the back 1. The said flange 50 has a'reinforced opening therein through which projects the pin 6 on the back of the sound box. A perspective view of this modified form is shown in Fig. 10. The small projections 53 are for the purpose of absorbing and not transmitting the heavy vibrations transmitted through the stylus bar.

From the foregoing and accompanying drawings, it will be seen that I haveprovided a sound box in which there is no chance for! the vibrations to "be transmitted from the needle to the vibrating wall through any metallic portion of the box. In other words, the box 1 upon which is formed the flat wall.2 is not only insulated as is usual from the diaphragmby means of a rubber gasket, butthe rear wall and the periphery of the back 1 are also effectually insulated from the cup shaped box 5 so that any. vibrations which might otherwise leak through the wood fiber collars 38 to the cup shaped box will be prevented from being transmitted by the back 1 to the machine. Furthermore, the fact that the back 1 having the flat wall 2 is not rigidly secured to the cup shaped box, but may vibrate slightly upon the pins 6, while the insulating medium between the parts, effectually prevents any metallic vibrations from being transmitted to the machine.

' It is obvious that changes and modifications may be made without departing from the spirit of my invention, the scope of which is set forth by the appended claims.

What I claim as my invention is:

1. The combination, in a sound box, of a box proper having a flange at the rear thereof, a back within the box with its rear surface facing the inner surface of said flange, said flange and said back having a pin and an opening, the pin on one part projecting into the opening in the other, and sound absorbing material between the inner surface of the flange of said box and the outer surface of said back and surrounding said pin. I

2. The combination, in a sound box, of a box proper having a flange at the rear thereof, aback within the box having its rear surface facing the inner surface of said flange, said flange and said back having a pin and opening the pin fitting within the opening, sound absorbing material between the edge of the back and the innor wall of the box proper, and sound absorbing material between the inner surface of-the flange of said box and the outer surface of said back, said material surrounding the aforesaid pin.

3. Ina sound box, a cross bar, and a stylus bar formed of one piece of material having [one end bent to be secured to the diaphragm and the other end formed of triangular shape adapted to receive a needle, said triangular part extending on both sides of said cross bar.

4. In a sound box, a cross bar, and a stylus bar \formed of one piece of material having one\ end bent to be secured to the diaphragm and the other end formed of triangular shape adapted to receive a needle, said triangular part extending on bolh sides if said cross ba and having an openin; at each end \vherebfr it Ina be loaded at the rear end.

The emnhinatiun, in a sound box, of a (T085 bar ha ring Securing members there on. projecting parts on said cross bar. e0]- iars secured between said prujeelin; parts 10 and said securing members. one nl' v aiii last nanm l pans beingadjuslalfle.

T11 iestinmn v whereof 1 aihx my signzv ture in presence of two nitnesses.

LOUIS K. NYYIFUI Y). \Vitnesses:

UicxnY F. llIAl'llil'lR, Vmm M. Biiiu-zxnuuu. 

